Originally Posted by

**dogma** Hi ppl, pretty new to maths. picked up a discrete mathematics unit this semester at uni for something a little different. got a quick question.

Question: given that *n* is an integer, prove that *n* is even if and only if 9*n*2 + 4*n* - 11 is odd.

Now, i already know that the above is true. just wondering what is the general accepted format to answer this type of question? i dont know what my answer is supposed to look like so could someone maybe do a quick demonstration proof of this question so i can see how this works?